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//! Updates tags from the NVS (default partition). | ||
//! | ||
//! Note that this module exposes two separate set of APIs: | ||
//! * the get_XXX/set_XXX API (where XXX is u8, str, etc.) - this is only for interop with C code that uses the C ESP IDF NVS API as well. | ||
//! * the `get_raw`/`set_raw` APIs that take a `&[u8]`. This is the "native" Rust API that implements the `RawStorage` trait from `embedded-svc` and it should be preferred actually, as you can layer on top of it any serde you want. | ||
//! | ||
//! More info reagarding NVS: | ||
//! https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/storage/nvs_flash.html | ||
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use esp_idf_sys::{self as _}; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported | ||
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use esp_idf_svc::log::EspLogger; | ||
use esp_idf_svc::nvs::*; | ||
use log::info; | ||
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fn main() -> anyhow::Result<()> { | ||
EspLogger::initialize_default(); | ||
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let nvs_default_partition: EspNvsPartition<NvsDefault> = | ||
EspDefaultNvsPartition::take().unwrap(); | ||
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let test_namespace = "test_ns"; | ||
let mut nvs = match EspNvs::new(nvs_default_partition, test_namespace, true) { | ||
Ok(nvs) => { | ||
info!("Got namespace {:?} from default partition", test_namespace); | ||
nvs | ||
} | ||
Err(e) => panic!("Could't get namespace {:?}", e), | ||
}; | ||
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let tag_u8 = "test_u8"; | ||
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match nvs.set_u8(tag_u8, 42) { | ||
Ok(_) => info!("Tag updated"), | ||
// You can find the meaning of the error codes in the output of the error branch in: | ||
// https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/error-codes.html | ||
Err(e) => info!("Tag not updated {:?}", e), | ||
}; | ||
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match nvs.get_u8(tag_u8).unwrap() { | ||
Some(v) => info!("{:?} = {:?}", tag_u8, v), | ||
None => info!("{:?} not found", tag_u8), | ||
}; | ||
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let tag_test_str = "test_str"; | ||
// String values are limited in the IDF to 4000 bytes, but our buffer is shorter. | ||
const MAX_STR_LEN: usize = 100; | ||
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let the_str_len: usize = nvs.str_len(tag_test_str).map_or(0, |v| { | ||
info!("Got stored string length of {:?}", v); | ||
let vv = v.unwrap_or(0); | ||
if vv >= MAX_STR_LEN { | ||
info!("Too long, trimming"); | ||
0 | ||
} else { | ||
vv | ||
} | ||
}); | ||
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match the_str_len == 0 { | ||
true => info!("{:?} does not seem to exist", tag_test_str), | ||
false => { | ||
let mut buffer: [u8; MAX_STR_LEN] = [0; MAX_STR_LEN]; | ||
match nvs.get_str(tag_test_str, &mut buffer).unwrap() { | ||
Some(v) => info!("{:?} = {:?}", tag_test_str, v), | ||
None => info!("We got nothing from {:?}", tag_test_str), | ||
}; | ||
} | ||
}; | ||
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match nvs.set_str(tag_test_str, "Hello from the NVS!") { | ||
Ok(_) => info!("{:?} updated", tag_test_str), | ||
Err(e) => info!("{:?} not updated {:?}", tag_test_str, e), | ||
}; | ||
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Ok(()) | ||
} |
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